TI486 Microprocessor - Al Kossow's Bitsavers

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A.14 Format of Data Used by SVDC/RSDC Instructions Format of Data Used by SVDCIRSDC Instructions The SVDC/REDC instructions should be used to change limits and r/w priveleges of segment registers before they are used by SMM code. The instructions use a 10 byte area that is comprised of two major portions of the segment register value/contents and the non-programmable visible internal descriptor that has the following format: ISegment Register Descripton 1 Segment Register Selector 1 1) Segment Register Selector: This is the segment if the segment register was loaded in real mode or the selector if the segment register was loaded in protected mode. In real mode, this is also equal to the Segment base divided by 10h and clipped to 16 bits. dw ISelector or Segment 2) Segment Register Descriptor, which is the actual descriptor if the segment was loaded in protected mode, or a psuedo-descriptor if the segment register was loaded in real mode. dw dw db db db db Limit Base A DscTy Limi t [ 15 : a ] 1 Base [15: 0] 1 Base [23: 16] 1 1 P 1 DPL 1 liE 1 DscTy[2:0] 1 A IG 1 D 1 r 1 AVL 1 Limit [19:16] 1 Base [31:24] 1 Max size Starting Address Segment Accessed Flag E == 1: Executable, CIR C 1: Conforming R -- 1: Readable E == 0: Data, EDlw ED == 1: Expand Down W == 1: Writable DPL P AVL D G Protection Level 1 Segment present, a not present a 16 bit address and operand size a byte, 1 page granular A-43
Format of Data Used by SVDCIRSDC Instructions Example: iLoad SS descriptor (non-programmer-visible region) values appropriate to REAL mode. INCLUDE smimac.inc value real_mode:dw dt ? Offffh dw 0 db 0 db 10010011B db 0 db 0 dw 0 location to store old ss limit base base 92h, data segment G=O, D=O, upper limit=O high portion of base selector/segment svdc rsdc mov mov cs: , [old_val] , ss ss, cs:, [real_mode] ax, cs ds, ax A-44 <strong>TI486</strong> SMM Programmer's Guide
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.TEXAS INSTRUMENTS TI486 Microproce
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TI486 Microprocessor Reference Guid
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Preface Read This First About This
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About This Manual Appendix D Orderi
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Contents 1 Product Overview .......
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Contents 5.5 AC Characteristics . .
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1-1 TI486SLC/E Functional Block Dia
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Figures 4-27 SUSP Initiated Suspend
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Tables 5-3 Absolute Maximum Ratings
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Product Overview 1-1
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Chapter 1 Product Overview Features
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1.2 Differences Between the TI486SL
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Tl486SLCIE Overview Figure 1-2. TI4
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Tl486DLCIE Overview 1.4 TI486DLC/E
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TI486DLCIE Overview The TI486DLC/E
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Power Management / System Managemen
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Programming Interface 2-1
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Chapter 2 In this chapter, the inte
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Processor Initialization Table 2-1.
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Instruction Set Overview 2.2 Instru
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Register Set 2.3 Register Set There
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Register Set Pointer and Index Regi
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Register Set 2.3.1.2 Segment Regist
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Register Set 2.3.1.3 Instruction Po
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Register Set 2.3.2 System Register
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Register Set 2.3.2.1 Control Regist
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Register Set 2.3.2.2 Descriptor Tab
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Register Set Table 2-6. Segment Des
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Register Set During task switching,
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Register Set The CCRO register (Tab
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Register Set Table 2-9. TI486DLCIE
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Register Set Table 2-12. ARR 1-ARR4
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Register Set 2.3.2.6 Test Registers
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Register Set Table 2-14. TR6 and TR
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Address Spaces 2.4 Address Spaces T
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Address Spaces 2.4.2 Memory Address
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Address Spaces Figure 2-21. Real Mo
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Address Spaces Figure 2-24. Paging
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Interrupts and Exceptions 2.5 Inter
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Interrupts and Exceptions 2.5.3 Int
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Interrupts and Exceptions Table 2-2
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System Management Mode 2.6 System M
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System Management Mode Figure 2-29.
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System Management Mode The new SMM
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System Management Mode During SMM o
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Protection The Current Privilege Le
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Virtual 8086 Mode 2.9 Virtual 8086
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TI486SLC/E Bus Interface 3-1
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Chapter 3 TI486SLC/E Bus Interface
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Overview Table 3-1. TI486SLCIE Sign
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Overview Table 3-2. Terminal Functi
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Overview 3.1.1 Bus Cycle Definition
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Overview Table 3-5 shows the state
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Functional Timing Figure 3-3. Bus A
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Functional Timing 3.2.2.1 Bus Cycle
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Functional Timing Non-Pipelined Wai
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Functional Timing Because of the de
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Functional Timing Pipelined Wait St
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Functional Timing Initiating and Ma
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Functional Timing Figure 3-12. Comp
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Functional Timing Figure 3-13. Inte
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Functional Timing Shutdown Indicati
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Functional Timing Figure 3-17. Pipe
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Functional Timing As shown in Figur
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Functional Timing Figure 3-19. Requ
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Functional Timing Figure 3-22. 8MI
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Functional Timing HALT Initiated Su
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Functional Timing 3.2.12 Float Figu
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TI486DLC/E Bus Interface 4-1
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Chapter 4 TI486DLC/E Bus Interface
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Overview Table 4-1. TI486DLCIE SIgn
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Overview Table 4-6. Signal States D
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Overview 4.1.2 Power Management 4.1
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Functional Timing 4.2 Functional Ti
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Functional Timing The TI486DLC/E da
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Functional Timing Non-Pipelined Rea
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Functional Timing Initiating and Ma
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Functional Timing Figure 4-8. Faste
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Functional Timing Figure 4-9. Vario
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Functional Timing Once a pipelined
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Functional Timing 4.2.3 Bus Cycles
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Functional Timing Pipelined Cycles
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Functional Timing LOCK is activated
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Functional Timing 4.2.6 Halt and Sh
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Functional Timing Figure 4-17. Pipe
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Functional Timing Figure 4-19. Non-
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Functional Timing The TI486DLC/E sa
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Functional Timing 4.2.9 Hold Acknow
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Functional Timing 4.2.10 Coprocesso
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Functional Timing 4.2.12 Power Mana
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Functional Timing Stopping the Inpu
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Electrical Specifications 5-1
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Chapter 5 Electrical Specifications
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ElectricalConnecnons It is recommen
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Recommended Operating Conditions 5.
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DC Electrical Characteristics Table
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AC Characteristics Figure 5-2. TI48
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AC Characteristics Table 5-9. AC Ch
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AC Characteristics Table 5-11. AC C
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____ AC Characteristics 5.5.3 RESET
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Mechanical Specifications 6-1
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Chapter 6 Mechanical Specifications
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Pin Assignments Table 6-1. TI486SLC
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Pin Assignments Figure 6-3. TI486DL
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Package Dimensions 6.2 Package Dime
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Thermal Characteristics 6.3 Thermal
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Instruction Set 7-1
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Chapter 7 Instruction Set This sect
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Instruction Fields 7.2 Instruction
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Instruction Fields 7.2.5 reg Field
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Instruction Fields Table 7-7. mod r
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Instruction Fields 7.2.11 sreg3 Fie
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Clock Count Summary 7.4 Clock Count
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--- --;.J -L 01 Table 7-17. Instruc
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I . ~ -.....J Table 7-17. Instructi
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Table 7-17. Instructions, Opcodes,
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Table 7-17. Instructions, Opcodes,
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-....J N (J.) Table 7-17. Instructi
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I I i I i Table 7-17. Instructions,
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Page 260 and 261: -....J N co Table 7-17. Instruction
Page 262 and 263: "-.I ~ Table 7-17. Instructions, Op
Page 264 and 265: Table 7-17. Instructions, Opcodes,
Page 266 and 267: U Appendix A TI486 SMM Pro rammer's
Page 268 and 269: SMM Implementation A.2 SMM Implemen
Page 270 and 271: Figure A-1. SMM Memory Space Header
Page 272 and 273: SMM Implementation 6) NMI is the on
Page 274 and 275: Instruction Summary A.4 Instruction
Page 276 and 277: Instruction Summary A.4.3 Resume No
Page 278 and 279: Instruction Summary A.4.6 Save LDTR
Page 280 and 281: 8MI Handler Example A.5 SMI Handler
Page 282 and 283: 8MI Handler Example execute_halt: C
Page 284 and 285: 8MI Handler Example COMMENT A The T
Page 286 and 287: 8MI Handler Example arrl arr2 arr3
Page 288 and 289: .MODEL SMALL . STACK .386P INCLUDE
Page 290 and 291: Testing/Debugging SMM Code sgdt COM
Page 292 and 293: Testing/Debugging SMM Code i*******
Page 294 and 295: TI486 Power Management Features A.7
Page 296 and 297: Detection of Tl486 CPU A.9 Detectio
Page 298 and 299: Detection of SMM Capable Version A.
Page 300 and 301: i**********************************
Page 302 and 303: A.11 SMM Feature Comparison SMM Fea
Page 304 and 305: SMM Instruction Macros COMMENT A Co
Page 306 and 307: SMM Instruction Macros SMM Instruct
Page 310 and 311: Altering SMM Code Limits A.1S Alter
Page 312 and 313: SMM Errata A.16 SMM Errata The foll
Page 314 and 315: Appendix B TI486 Cache Flush B.1 Ge
Page 316 and 317: Appendix C TI486 BIOS Modification
Page 318 and 319: Introduction Some example assembler
Page 320 and 321: Appendix D Ordering Information 0.1
Page 322: ~TEXAS INSTRUMENTS Printed in U.S.A
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TI486 Microprocessor - Al Kossow's Bitsavers

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